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ADDISON C. FLETCHER, OF NEW YORK, N, Ye.

. Letters Patent No. 61,615, dated January 29, 1867.

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TO ALL WHOM IT MAY CONCERN: l l

Be it known that I, ADDISON C. FLETCHER, of the city, county, and Stateof New York, have invented a new and useful Improvement Vin Grate Bars;and I do hereby declare vthat thefollowing'is a full, clear, and exactdescription of the same, reference boing had to the accompanyingdrawings, forming part of this speciyiication, in Which- Figure 1is aside view of a grate bar with my improvement. Figure 2 is a longitudinalverticalsection of the same. Figure 3 is a plan of the same. .i Figure-4is a verticalsection ofthe same. Y v Figure 5 is a vertical sectionofthe fire-place of a cylinder boiler, illustmting the application ofthe grate bar. Figure 6 is.a vertical section, illustrating theapplication of thc invention to a cylinder stove.

Figure 7 is a vertical section illustrating the application of theinventionto 'an open fire-place for houses.'

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention consists in an improvement in the step=formcd grate bar,which is the subject-matter of an application for Letters Patent,allowed January 3l, 1866, the object of such improvement being toincrease the eliiciency and durability of' such a bar, or ofa grateformed of such bars.

The only parts'of the bar, the construction of which diii'ers in anyessential respect from that of the bar represented and described in myabove-*mentioned former application, are the transversely arranged Webs,'a a,

' by which the severalsteps A A of the bar are connected. Thesewcbs,iinstcad 'of being vertical, are vsloping so as to give their facesan upward inclination, `as' shown in figs. 1 and 2, and they are facedwith slabs of firebrick,.soapstone, or other refractory material, b 6.The faces of the said Webs a a may be perforated in any suitable manner,but I prefer to make them 'with horizontal slots,'e e, and grooves, d d,as shown in fig. 4, in which one of the facing slabs l is omitted toexpose the web to-view. The facing slabs b Z7 have numerousperforations, g g, arranged in any suitable manner opposite to the slotsand grooves of `the webs, and are secured to the said webs partly byhalf dove-tail flanges, c c, at the tops f the Webs, and partly bybolts, ff, passing through the slabs and webs and fitted with nuts atthe, backs of thc webs. The perforations g and slots e e, areperpendicular to the faces of the slabs b 6 and webs a a, and hence, asthe falcesof the said webs and slabs havean upward inclination, the jetsof air admitted Athrough the said perforations are delivered in anoblique 'upward direction, whereby they are caused to'mix moreintimately with' the combustible gases illuminated from the fuel on thesteps A A, than when delivered in a horizontal direction, as they arethrough the perforations 'of the vertical webs, and hence a moreperfeetcombustion of these gases is effected, 'and a greater length offlame is obtained by my improvement. 4The facing slabs of' refractory`-material protect the faces of the. webs a a from the intense heat of thefuel ,in contiguityto the'webs, and hence'render the grate bars lessliable to burn out in those parts, and more-durable.

What I 'claim as my invention, aud-desire to secure by Letters'Paten isf 1.4 The arrangement of the connecting webs a, of the steps 1n astep-formed grate bar, in inclined or sloping positions, substantiallyas'and for the purpose herein described. v

2L The facing slabsb b, of refractory material, in Vcombination with theconnecting Webs of the steps of a step-formed grate bar, substantiallyas and for 'the purpose herein specified.

ADDISON c'. FLETCHER.

Witnesses:

HENRY T. BROWN, J. W. CooMBs.

